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Ann Thorac Surg 1994;58:404-408
© 1994 The Society of Thoracic Surgeons
Division of Cardiovascular Surgery, Department of Surgery, and Division of Cardiothoracic Anesthesia, University of Maryland Medical System, Baltimore, Maryland USA
* Address reprints requested to Dr Krasna, General Thoracic Surgery, University of Maryland Medical System, Baltimore, MD 21201.
As more complex thoracoscopic procedures are performed, adequate exposure becomes increasingly more important. The insufflation of CO2 has been demonstrated to aid in the compression of lung parenchyma and the effacement of subpleural lesions, and to act as a retractor when combined with changes in patient position. However, a recent study demonstrated that CO2 insufflation during thoracoscopy in the pig had adverse hemodynamic consequences. We prospectively studied 32 patients undergoing thoracoscopy to evaluate the effects of CO2 insufflation in the clinical setting. The end-tidal CO2 pressure, arterial oxygen saturation, mean arterial pressure, heart rate, and central venous pressure were monitored. Measurements were determined at baseline, at the initiation of one-lung ventilation, and at intrapleural pressures of 2 to 14 mm Hg. We found that the insufflation of CO2 of 2 to 14 mm Hg had no significant effect on the end-tidal CO2 pressure, arterial oxygen saturation, heart rate, or mean arterial pressure, but the central venous pressure did rise from 7.00 ± 1.5 mm Hg to 17.30 ± 2.53 mm Hg (p < 0.05). We conclude from this that the insufflation of CO2 during thoracoscopy does not have adverse hemodynamic effects in the clinical setting. Therefore, we propose that low-pressure (< 10 mm Hg) insufflation is a safe adjunct to the conduct of routine thoracoscopic surgical procedures.
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